at42qt1070 ATMEL Corporation, at42qt1070 Datasheet - Page 34

• Manufacturer Part Number: at42qt1070
• Description: Qtouch 7-channel Sensor Ic
• Manufacturer: ATMEL Corporation

Contents
34
AT42QT1070
1
2
Features ..................................................................................................... 1
Pinouts and Schematics ......................................................................... 2
Overview ................................................................................................... 9
1.1
1.2
1.3
1.4
1.5
1.6
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
2.12
Pinout Configuration – Comms Mode (14-pin SOIC) .........................................2
Pinout Configuration – Standalone Mode (14-pin SOIC)....................................2
Pinout Configuration – Comms Mode (20-pin VQFN) ........................................3
Pinout Configuration – Standalone Mode (20-pin VQFN) ..................................3
Pin Descriptions..................................................................................................4
Schematics .........................................................................................................6
Introduction.........................................................................................................9
Modes.................................................................................................................9
Keys....................................................................................................................9
Input/Output (IO) Lines .......................................................................................9
Acquisition/Low Power Mode (LP)....................................................................10
Adjacent Key Suppression (AKS) Technology .................................................10
CHANGE Line (Comms Mode Only) ................................................................10
Proximity Sensing.............................................................................................11
Types of Reset .................................................................................................11
Calibration ........................................................................................................11
Guard Channel .................................................................................................11
Signal Processing.............................................................................................12
2.2.1
2.2.2
2.9.1
2.9.2
2.12.1
2.12.2
2.12.3
2.12.4
2.12.5
2.12.6
2.12.7
Comms Mode ............................................................................... 9
Standalone Mode.......................................................................... 9
External Reset ............................................................................ 11
Soft Reset ................................................................................... 11
Detect Threshold ........................................................................ 12
Detect Integrator ......................................................................... 12
Cx Limitations ............................................................................. 12
Max On Duration......................................................................... 13
Positive Recalibration ................................................................. 13
Drift Hold Time............................................................................ 13
Hysteresis ................................................................................... 13
9596A–AT42–10/10